[Faculty] Fwd: [CSRC-SDSU COLLOQUIUM]: Bubble Dynamics with Biomedical Applications

[Jose Castillo]

*DATE: * Friday, November 1st, 2013

*TITLE: * Bubble Dynamics with Biomedical Applications

*TIME:*  3:30 PM

*LOCATION: * GMCS 214

*SPEAKER:*  Dr. Tim Colonius. Dept. Mechanical and Civil Engineering
(CalTech)

Shock and ultrasonic waves in water often induce the growth and collapse of
cavitation bubbles, or clusters of bubbles, which, in turn, can lead to
erosion and other types of damage to nearby materials and structures. In
traditional applications like marine propellors, cavitation erosion is
unambiguously undesirable, but in medical procedures such as lithotripsy
and histotripsy, cavitation can amplify shock energy and thereby mediate
stone erosion and tissue ablation, respectively, but it can also lead to
collateral damage and other bioeffects. We pose a series of model problems
aimed at understanding the mechanisms at play during shock-induced collapse
of cavitation bubbles near surfaces. Numerical simulations of one or a few
bubbles allow us to quantify the stresses induced in nearby surfaces and
understand the role played by secondary shocks emitted during bubble
collapse. Under repeated shocks or continuous irradiation, clusters or
clouds containing many bubbles are formed, and the complex, collective
behavior of the cloud can lead to even greater focussing of energy or, at
sufficiently high void fractions, to undesirable scattering and dispersion
of energy. Continuum bubbly flow models have been employed to qualitatively
describe these effects, but quantitative predictions, especially at
relatively high void fractions, require both better models and less
computationally intensive ways to represent a poly-disperse cloud of
bubbles. We close by describing recent a recent effort aimed at achieving
these goals.

*HOST:*  Dr. Guus Jacobs

For future events, please visit our website at:

http://www.csrc.sdsu.edu/colloquium.html



-- 

Jose E. Castillo  Ph.D.

Director / Professor

Computational Science Research Center

5500 Campanile Dr

San Diego State University

San Diego CA 92182-1245

619 5947205/3430, Fax 619-594-2459

 http://www.csrc.sdsu.edu/mimetic-book/

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